/*
 * Copyright 2021 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package androidx.window.area

import android.app.Activity
import android.os.Binder
import androidx.window.core.ExperimentalWindowApi
import java.util.concurrent.Executor
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.flowOf

/**
 * Empty Implementation for devices that do not support the [WindowAreaController] functionality
 */
@ExperimentalWindowApi
internal class EmptyWindowAreaControllerImpl : WindowAreaController {

    override val windowAreaInfos: Flow<List<WindowAreaInfo>>
        get() = flowOf(listOf())

    override fun transferActivityToWindowArea(
        token: Binder,
        activity: Activity,
        executor: Executor,
        windowAreaSessionCallback: WindowAreaSessionCallback
    ) {
        windowAreaSessionCallback.onSessionEnded(
            IllegalStateException("There are no WindowAreas"))
    }

    override fun presentContentOnWindowArea(
        token: Binder,
        activity: Activity,
        executor: Executor,
        windowAreaPresentationSessionCallback: WindowAreaPresentationSessionCallback
    ) {
        windowAreaPresentationSessionCallback.onSessionEnded(
            IllegalStateException("There are no WindowAreas"))
    }
}
